miller: update to 5.7.0.

ChangeLog:

Features

    The new remove-empty-columns and skip-trivial-records are
    keystroke-savers for things which would other require DSL
    syntax, as tracked in #274.

Bugfixes

    A bug regarding optional regex-pattern groups was fixed in
    #277.

    As of #294 you can now specify --implicit-csv-header for the
    join-file in mlr join.

    A bug with spaces in XTAB-file values was fixed on #296.

    A bug with missing final newline for XTAB-formatted files
    using MMAP files was fixed on #301.

Documentation

    Look-and-feel at http://johnkerl.org/miller/doc/ is (hopefully)
    improved, including clearer visual indication of which section/page
    you're currently looking at. Note that this change has been
    live for a few weeks, as look-and-feel-related doc-mods from
    post-5.6.2 were backported to http://johnkerl.org/miller/doc/.

    #282 improves DSL-function documentation at
    http://johnkerl.org/miller/doc/reference-dsl.html#Built-in_functions_for_filter_and_put,_summary

Note

Support for mmap mode has been entirely discontinued. This is an
invisible change and should not affect you at all. For anyone
interested in lower-level details, though, the summary is as follows:

    For an incremental performance gain (perhaps 10-20% run time
    at most, but see below), within the C source code one can use
    the mmap system call to access input files via pointer arithmetic
    rather than malloc-and-memcopy using stdio.

    However mmap is not available when reading from standard
    input -- it cannot be memory-mapped.

    This means all file-format readers are implemented twice
    within the Miller source code.

    While I try to regression-test Miller thoroughly, running
    all canned tests through mmap and stdio mode, I've nonetheless
    found my mmap implementations liable to corner-cases which I
    miss but users find: for example #29, #102, and #296.

    As tracked on #160, various operating systems do not release
    mmapped pages after use as one might intuit, meaning that for
    large files and/or large numbers of files, I've for a long time
    now needed to have Miller opt out of mmap usage for precisely
    those cases which most need the performance gain: see #160,
    #181, and #256.

    Additionally, mmap is not used at all for Windows/MSYS2 so
    there is nothing to lose there.

For these reasons, keeping mmap mode isn't worth the development
overhead.

As of release 5.6.3, the mlr executable will still accept the --mmap
and --no-mmap command-line flags as no-ops, for backward compatibility.

The caveat for you is that for everyday small files, the default
was previously mmap mode and is now stdio (except mlr ... < filename
or ... | mlr ... which have always used stdio). There is the off
chance that this will newly reveal an old, latent bug or two
somewhere.

I've re-run regressions in valgrind mode to aggressively catch any
errors, but, please let me know ASAP via GitHub issue of any
unexpected behavior in 5.7.0.

textproc/miller/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.16 2020/03/06 08:18:31 fcambus Exp $
+# $NetBSD: Makefile,v 1.17 2020/03/17 14:38:25 fcambus Exp $
 
-DISTNAME=	mlr-5.6.2
+DISTNAME=	mlr-5.7.0
 PKGNAME=	${DISTNAME:S/mlr/miller/}
 CATEGORIES=	devel
 MASTER_SITES=	${MASTER_SITE_GITHUB:=johnkerl/}

textproc/miller/distinfo

@@ -1,6 +1,6 @@
-$NetBSD: distinfo,v 1.15 2020/03/06 08:18:31 fcambus Exp $
+$NetBSD: distinfo,v 1.16 2020/03/17 14:38:25 fcambus Exp $
 
-SHA1 (mlr-5.6.2.tar.gz) = 4a3fb995a65a9960bb2e53bd565081d491aba8b1
-RMD160 (mlr-5.6.2.tar.gz) = 51e6d16ca6d012e47d8cad29d643c7da943a0535
-SHA512 (mlr-5.6.2.tar.gz) = d5c984c1db045219c79564251193ec4887582987cde980df6705e10e246d230d92fd9197e2c207545133f96e7cd292fc1eb494e8c57384d6ba0a90a83c4f1dd9
-Size (mlr-5.6.2.tar.gz) = 1280257 bytes
+SHA1 (mlr-5.7.0.tar.gz) = 50b18bb10bbf8a5e03f58b2ecd7809844834ed43
+RMD160 (mlr-5.7.0.tar.gz) = 3b3454bdd5ff771c8521a07ccd66e5932fc67af8
+SHA512 (mlr-5.7.0.tar.gz) = a801c9e6e10422cd0cc79c117ce7d49268f6d2bbe7c625fed0dd9144fcb7f5d2382a4450772f468f3d31b61912206bd8686f9c78fca2dbd372ee1e003f9cff88
+Size (mlr-5.7.0.tar.gz) = 1266826 bytes